Let-off or warp-tension device for looms.



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W. LORD. LET-OFF 0R WARP TENSION DEVICE FOR LOOMS. APPLICATION FILED APR. 22, 1912.

2 SHEETSSHEET 1.

W/Z'llz'argz Zora,- amend/1 0v I 35131113 grimy 1e1 Patented Nov. 10, 1914.

2 SHEETS-BREE! 2.

Patented Nov. 10, 1914 W. LORD.

William Zora; 3] vwe nfoz 9 atto zmc s v APPLICATION FILED APR. 22, 1912.

LBT-OFF'OR WARP TENSION DEVICE FOR LOOMS.

HEB

witnesses I 1,11'z,or1.

UNITED STATES PATENT OFFICE."

mun Loan,

OF NEW YORK, N.' Y., ASSIGZNOR TO HARTFORD RUBBER, WORKs COMPANY, A GORPORATION OF CONNECTICUT.

Lnr-orr on wanr-rnnsmn n'nvxc n 'ron LQOMS.

Specification of Letters Patent. Application-filed Apri122, 1912. Serial No. 692,855.

' I To all whom it may concern .for Looms, of which the following is a full,

clear, and exact disclosure.

The object of my invention is to provide a; let-01f mechanism and tension device for looms which is mechanically controlled not by the tension of the warp but by the position of the whip-roll and which at the same time is very sensitive and efficient in securinga uniform let'ofi of the warp-threads. thereby enabling the fabric tobe woven with a uniform mesh and of a uniform width.

Briefly my invention comprises the employment of weighted levers ivhich act upon a movable bar termed a whip-roll, over which the warp-threads pass from a warpbeam' or spool. The rotation of the warp beam is controlled through the medium of a friction clutch interposed in the mechanism for rotating the warp-beam, said clutch being controlled by said levers.

For adetailed description of one form of my invention, which I at present deem preferable, reference may be had to'the following specification and the accompanying drawings forming a part thereof, in which:

Figure 1 is a side elevation of the warpend of a loom showing my improved let-ofl" device applied thereto; and Fig. 2 is anend elevation of the same.

Referring to the drawings, the numeral 1 indicates the warp-beam or spool on which the warp-threads are wound. Said threads 2 pass thence over the movable whip-roll 3, as indicated in Fig. 1, and thence under the binder. bar as indicated at 4 by dotted lines From this point the warp-threads then run to the heddles in the usual manner. The whip-roll 3 is fixed on suitable brackets 5 which are fixed on the transverse shaft carried in the grooved bearings 7, Upon one end of the shaft 6 is fixed a lever Scan rying at its off-set upper end two adjustable weights 9 and 10. The opposite end of the shaft 6 carries a downward off-set lever 11 which also carries an adjustable'weight 12 atiits outer end. These weights), and 12 are What primarily produce the uniformte'nsion upon the warp-threads.

I'hedet-ofi ofthc- Warp is t y-fine" following mechanism: The warp-beam or spool 1 carries the usual gears 13 fixed to the ends thereof. Gne of these gears is adapted to mesh with the small spur-gear 14 fixed to the end of a shaft 15 which rotatably mounted the bearing 16 fixed to the lower portion of the frame of the loom. The outer end of the shaft 15 carries a worm-gear 17.

' Patented Nov. 10, 1914.

This engages a screw-gear 18? fixed to the 1 end of a shaft 18, inclined somewhatto a horizontal line, and which is 'journaled in the bearing 19, attached to-the lower portion of the frame of the loom. The upper end of the shaft -18may have a hand-wheel 20 attached-thereto for rotating the warp-beam independently of its driving mechanism when necessary. Keyed to the shaft 18, and slid'abie longitudinally thereon, is one member 21 of a riction clutch having a grooved collar QQ-engaging a-yoke 23 carried on the lever 24. This lever is" pivoted at its lower end to astud 25 projecting from the frame of the loom. The upper end of the lever 24' is slotted, as indicated at 26, and engages a pin 27 projecting from the weighted lever 11'. Mounted loosely on the shaft 18 is a second member 28 of the friction clutch which has fixed to it a bevel gear 29. This 1 bevel gear meshes with a bevel gear 30 carried on the transverse driving shaft 31,

which latter may be constantly driven in any suitable or well-known way.

It will now be seen that when the picks advance the warp 2 the whip-roll 3 is deshaft having the hand-wheel 20, which Will cause the, screw-gnarl? and the spur-gear 14 to turn in an anti-clockwise direction, as indicated by the arrow in Fig. 1. Consequently, the warp-beam will be turned in a. clockwise direction, as indicatedby the arrow, and the warp let oil or advanced. Since this allows the whip roll to'rise and the-weights to be lowered, the clutch membore 21- and 22 will be disengaged, and the :rotation of the warp-beam will cease until ,thepicks of theloom have a exegesis-mu. It will bev-v vio'usy y in de ressed son of the comparatively long distance be.-

, tween the fulcrum 6 of the lever 11 and the pin 27 that a very slight movement of the whip roll only is required to determine the frictional engagement or disengagement be.

tween the members 1-1 and 28 of the friction.

' clutch, and since the let-off .action is independent of the-tension produced by the con- '11 being arrai'iged sothat the weights '9 and stant weights," the tension of the warp will ,be maintained constant. The levers 8 and 10 as regards the weights lQ- are substantially at right an'glesto the shaft 6. The eifect'ofthe weights 9 and 10 will increase as they descend and 'comperisate for any decrease of the weight l2 as it descends,

thus making the tension upon the warp constant, althouglr the-weights move in arcs above and below the level of the shaft 6.

In other Words,the effective center of grav of the combined weights is one horizdntal plane with the axis of theshaft 6. Owing to the'nature of the friction'clutch, the device is particularly free from the effect of the relative humidity and dryness of the atmosphere and the tension maintained the samein spite of variations in weather conditions. The tension of the warp being produced primarily by the Weighted levers, or in other words, by force of gravity, is no variation o-f'this force and a complete ,warp may be run through the loom and woven into fabric without. any adjustment whatever of the weights, and in fact, as a matter of practice, it has been found-that a number of warps may be run through|the loom without any adjustment of the weights or thelet-off device whatever. In view of these advantages, my improved,let-ofi' device is particularly adapted for weaving canvas or duck to be used inthe manufacture of pneumatic automobile tires in which the tension and crimp between the warp and the woof threads should be absolutely the same,

in view of the fact that this fabric when so employed is usually cut onthe bias. The uniform 'lnesh produced by vice also enables the reticular nature of the fabric to be constant and unvaried, therebyskilled in the art without departing from l I the spirit'a'nd scope I 1 QWhatLI claim and desire to rotect by Letters Patent isz E-e leti-ofi, anc r "l awe,

of I my invention,

there -'-wi thawarpbeain,

for', a whip roll, :3;

1 bination of a warp-beam, driving 'mechzn nism therefor, a clutchin said driving mech anism, a lever for op'erating said clutch, a

whipr0ll, weighted levers supportin said 1c: whip-roll, and a pin and slot connection between one of said weighted levers and said clutch lever to give a transverse movement to said clutch leverto operate the clutch.

2. In a let-off device for looms, the combination of a'warp-beam, driving mechaing mechanism, a lever for moving one mem be' of said clutch, a-whip-roll, weighted levers supporting said whip-roll, one of which acts directly on said clutch-lever to make said clutch operative or inoperative.

- 3. In a let-off device for looms, the combinationof a warp-beam,intermittent driving mechanism therefor, a whip-roll, horizontally extending levers supporting said jnisin therefor, a friction clutch'in'said driV- whiproll, adjustable weights carried by said levers, and acontrolling lever connect-- mg directly between, one of sald levers andsa1d driving mechanism. for rendering the latter active or inactive.

4:, In a let-off device for looms, the com bination of a warp-beam, 'driving mechanism therefor, a whip-roll, weighted levers,

supporting said whip-roll at eachendthere I of, one of said leversbeing horizontally off-1 set above said roll and the other being hori zontally off-set below said roll, and-connecting'means between the latter lever and, said driving mechanism for rendef'i active or inactive.

In a let-01f 'for'looins, the; combination.

with a warp beam, driving mechanism therefor, 'a whip roll, weightsffor moving said whip roll, a levercontrolledby the position of said whip rolhthe outer end of said. lever being-much longer than the distance; from its fulcrum to theaxis of s'aidlrolly friction clutch for connecting and disconnecting said driving mechanism, andmeans connecting said clutch with a pointed-incentthe outer end of said lever for renderin the.

former active by a slightmovement o the latter. i

ng the latter;

6. In -a.let-ofi"fo r looms, the combination I with a warp beam-driving mechanism therefor a whip roll, weighted levers supporting? said whip .roll', said levers being relatively much longer than the distance from their qfulcrumsto the axis of saidroll, afriction clutch for connecting and disconnectingsaid driving. mechanism, and means connecting said clutch with a pointadjacent the outer end ofoneof said levers for'rendering the former activebya slight movement of the atter.

- In a let-off for looms, thecombinatiom driving mechanism ther'eshaft about which;

Whlp roll may oscillate,

or inoperative, and a connection between a Y point adjacent the outer end of said lever 1 and said clutch for rendering the latter active by a slight movement of the whip roll.

' 8. In a let-ofi' for looms,.the' combination with a warp beam, driving mechanism therefor, a whip roll, a shaft about which said whip roll may oscillate, a relatively long weighted lever fixed on said shaft, connections between said shaft and said whip roll for oscillating the same, a friction clutch for rendering said driving mechanism oper- 15 ative or inoperativeg a connection between a point adjacent the outer end of said lever and said clutch for rendering the latter active by a slight movement of the whip roll, and a stationary binder bar about which 20 the warp passes after leaving the whip roll.

Signed in the city, county and State of New York, this 19th day of April, 1912.

WILLIAM LORD.

Witnesses:

Enw; W. VAILL, Jr., K. M. THOMPSON; 

